Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:42 2012 Optimize a model with 527 rows, 147 columns and 1054 nonzeros Presolve removed 85 rows and 0 columns Presolve time: 0.00s Presolved: 442 rows, 147 columns, 937 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.400000e+01, 253 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.00000 0 130 50.00000 64.00000 28.0% - 0s 0 0 61.70408 0 144 50.00000 61.70408 23.4% - 0s 0 0 61.00000 0 116 50.00000 61.00000 22.0% - 0s 0 0 60.69113 0 142 50.00000 60.69113 21.4% - 0s 0 0 60.03887 0 147 50.00000 60.03887 20.1% - 0s 0 0 59.79545 0 145 50.00000 59.79545 19.6% - 0s H 0 0 52.0000000 59.79545 15.0% - 0s H 0 0 54.0000000 59.79545 10.7% - 0s 0 0 59.62343 0 146 54.00000 59.62343 10.4% - 0s 0 0 59.42727 0 145 54.00000 59.42727 10.1% - 0s H 0 0 55.0000000 59.42727 8.05% - 0s 0 0 59.26842 0 147 55.00000 59.26842 7.76% - 0s 0 0 59.15613 0 146 55.00000 59.15613 7.56% - 0s 0 0 59.10216 0 144 55.00000 59.10216 7.46% - 0s 0 0 59.05033 0 147 55.00000 59.05033 7.36% - 0s 0 0 59.05033 0 147 55.00000 59.05033 7.36% - 0s 0 2 59.04299 0 147 55.00000 59.04299 7.35% - 0s * 40 13 9 56.0000000 58.62513 4.69% 46.4 0s Cutting planes: Zero half: 103 Explored 80 nodes (4309 simplex iterations) in 0.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%